Notching
Updated 2026-10-27
Data records
- In IEEE 1159-2019 notching is a periodic voltage disturbance caused by the normal operation of power electronic converters as current commutates from one phase to another, creating a momentary short circuit between two phases; it is steady state yet carries high-frequency content, so it sits between transients and harmonic distortion and may exceed what typical harmonic instruments can characterize.
- IEEE 1159-2019 describes voltage notching ringing as a variant in which a system resonance produces a ringing response at each commutation notch, typically on distribution systems feeding large commutating converter drives, mitigated by changing the resonance with harmonic filters or capacitor banks.
- IEEE 519-2022 defines a notch as a switching or other disturbance of the normal voltage waveform lasting less than half a cycle, initially of opposite polarity so that it subtracts from the waveform peak, and defines notch depth as the average depth below the sine wave and notch area as depth multiplied by width.
Sources
- IEEE 1159-2019, Recommended Practice for Monitoring Electric Power Quality, 2019 edition, IEEE. Cited: clause 4.4.5.4; clause 4.4.5.5. Held as: Purchased single-user copy. Publisher page for IEEE 1159-2019Publisher information page
- IEEE 519-2022, Harmonic Control in Electric Power Systems, 2022 edition, IEEE. Cited: clause 3.1. Held as: Purchased single-user copy. Publisher page for IEEE 519-2022Publisher information page
Obtaining the documents
- IEEE 1159-2019: available from the publisher
- IEEE 519-2022: available from the publisher
Changelog (3 entries)
| Date | Revision | Change |
|---|---|---|
| 2026-10-27 | created (gloss.notching.ieee1159.definition) | |
| 2026-10-27 | created (gloss.notching.ieee1159.ringing) | |
| 2026-10-27 | created (gloss.notching.ieee519.definition) |
Cite this page
Cite the governing standard for the fact itself; cite this page as the finding aid.
"Notching." Power Quality Reference. 2026-10-27. https://www.powerqualityreference.com/glossary/notching/.
Power Quality Reference, Notching (Oct. 27, 2026), https://www.powerqualityreference.com/glossary/notching/.
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title = {Notching},
howpublished = {\url{https://www.powerqualityreference.com/glossary/notching/}},
organization = {Power Quality Reference},
publisher = {Power Quality Reference},
year = {2026},
note = {last substantive change 2026-10-27}
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